Attachment 1 

Chesterfield Site Visit Presentation 
CHESTERFIELD POWER 

STATIONSeptember 2, 2009
FACTS

 Station started production in July, 1944 Currently 260 station employees Largest fossil-fueled power station in the Domini

system

 Station burns approximately 10,000 tons of coal 

daily (100 rail cars)
GENERATION TECHNOLOGIES

 Four Pulverized Coal-Fired Units

 Unit 6 – 660 nMW, commissioned 1969 Unit 5 – 321 nMW, commissioned 1964 Unit 4 – 163 nMW, commissioned 1960 Unit 3 – 101 nMW, commissioned 1952

 Two Combined Cycle Gas/Oil-Fired Turbines

 Unit 7 – 201 nMW, commissioned 1990 Unit 8 – 204 nMW, commissioned 1992
COMBUSTION TURBINE
UNITS 7 AND 8

 Peaking units Can fire either #2 fuel oil or natural gas All wastewater is taken via the station sump 

system to the lower ash pond
FUEL CONSUMPTION – UNITS 7 & 

 2008:

 5,400 gal #2 fuel oil 5.7 billion cf nat gas

 2009 (thru July)

 184,100 gal #2 fuel oil 4.4 billion cf nat gas

 2008:

 9,300 gal #2 fuel o 5.4 billion cf nat g

 2009 (thru July)

 46,000 gal #2 fuel  5.8 billion cf nat g

Unit 7 Unit 8
COAL-FIRED BOILERS
COAL CHARACTERISTICS

 BTU (12,500 BTU/lb) Sulfur Content

(< 1.6 lb/mmBTU, <1%)

 Chlorine Content

(varies)

 Ash Content (6 - 13%)

 BTU (12,900 BTU/ Sulfur Content

(1.6 – 3.2 lb/mmBTU,1% 

 Chlorine Content

(0.09 – 0.18%)

 Ash Content (7 – 1

Low Sulfur Coal High Sulfur Coal
NOX CONTROLS – COAL UNITS

 Units 3, 4, 5, and 6 have low NOx burners Units 4, 5, and 6 have SCRs All SCRs are run year-round beginning in 200 Target NOx reduction of approximately 90%
SCRS – AMMONIA USAGE

 Unit 4 SCR was put in service in 2003

 Ammonia Use

 2008 = 1,238,041 lbs 2009 (thru July) = 739,986 lbs

 Unit 5 SCR was put in service in 2002

 Ammonia Use

 2008 = 2,030,824 lbs 2009 (thru July) = 1,560,595 lbs

 Unit 6 SCR was put in service in 2004

 Ammonia Use

 2008 = 4,377,962 lbs 2009 (thru July) = 3,071,091 lbs
PM CONTROLS

 Units 3, 4, and 5 have cold-side ESPs

 Efficiency from 96 – 99% PM limit for each unit of 0.1 lb/mmBTU

 Unit 6 has a pulse jet fabric filter (baghouse)

 Operational in April 2008 Efficiency >99% PM limit of 0.03 lb/mmBTU
SO2 CONTROLS

 Unit 6 has FGD

 Scrubber on-line April 2008 Limit is 95% SO2 removal on 30-day rolling avera Current 30-day rolling average is approximately 

97.5%

 FGD for Units 3, 4, and 5 currently under 

construction

 Scrubber tie-ins will be staged and will begin in 20 Limit for Unit 5 will be 95% SO2 removal on 30-da

rolling average
UNIT 6 - SCRUBBER

 All make-up water is taken from Proctor’s Creek Wastew

Treatment Plant discharge

 Typical solids concentration in the scrubber is 14% - 20% Typical Chlorides Concentration in the scrubber is 19,000 

25,000 ppm

 Blow down from the scrubber to the primary hydroclone i

generally once every 12 hours and last for 10 – 12 hours

 Design flow rate of blow down from the scrubber to the pr

hydroclone is 1,328 gallons per minute

 Design flow rate of the primary hydroclone overflow back 

scrubber is 990 gallons per minute
UNIT 6 - SCRUBBER

 All gypsum is produced beneficially reused to 

manufacture wallboard

 Contract with US Gypsum (USG) details the 

specifications that must be met, including:

 10% moisture or less 100 ppm chlorides or less
UNIT 6 - SCRUBBER

 Limestone Usage

 2008: 46,834 tons 2009 (thru July): 46,333 tons

 Gypsum Production:

 2008:

 62,920 tons (to USG for beneficial reuse) 3,028 tons (to Upper Pond Closure)

 2009 (thru July):

 74,628 tons (to USG for beneficial reuse)
WASTEWATER TREATMENT PLANT

 Wastewater sludge is transported via truck to 

Shoosmith Sanitary Landfill

 WWT plant on-line in December 2008 WWT Sludge production:

 2008: 14.29 tons 2009 (thru July): 696.62 tons
VPDES PERMIT
VPDES PERMIT

 VPDES Permit No. VA0004146 Current permit expires December 9, 2009 Renewal application submitted May 28, 2009
VPDES OUTFALLS

 001 – Thermal Discharge (Units 7 & 8) 002 – Thermal Discharge (Unit 3) 003 – Thermal Discharge (Units 4, 5, and 6) 004 – Lower Ash Pond 005 – Upper Ash Pond 104 – Metals Pond (internal discharge to 004) 006 – 011: Screen Backwash Discharge 

(Units 3 – 8)
METALS POND

 Pre-treat low volume wastes prior to discharge 

the lower pond 

 Pond capacity is approximately 19 million gall
LOWER ASH POND

 Actively receives liquid-borne material Receives: boiler blowdown, ash sluice water, c

pile runoff, WWTP effluent, metals pond treatdischarge

 Pond capacity is approximately 242 million 

gallons
UPPER ASH POND

 Undergoing closure and does not receive any 

liquid-borne material

 Constructed as wet pond in 1983 Closure began in 2002 Closure is addressed in Special Condition B.8 o

station’s VPDES permit
ASH HANDLING
Ash is sent to the lower ash pond in a 

slurry (approximately 20% ash by weight). 

In the pond, the ash settles out by gravity.
The ash is excavated from the lower pond, 

dewatered, and then loaded and hauled by 

truck to the upper pond/dry storage facility.
Ash is placed and compacted in the upper 

pond/dry storage facility.
The upper pond/dry storage facility is covered with

soil and vegetation to protect against wind and 

water erosion.
QUESTIONS?
TOUR
STATION SAFETY

• Always wear the personal protective equipment (PPE) provide

hard hat, ear protection, and safety glasses. Safety is a primafocus!

• Hold handrails on stairs, but please do not touch anything els

many objects are hot or dirty; some objects may affect station operation.

• For those afraid of heights – there is steel grating in some are• Please stay in a tight group (no stragglers please) and out of a

barricaded areas.

• Be aware and cautious around any operating equipment.• There are many loud noises in the plant – please look toward

your tour guide for guidance – we will try and speak up to ansany questions.
Attachment 2 

Picture of Chesterfield’s Permitted Outfalls and Water Balance Diagram 
Chesterfield Power Station 


Permitted Out/ails 


VPDES Permit No. VA0004146 


Attachment 3 

FGD System Process Flow Diagram and Pictures of the Dual Flow Trays 

Dominion – Chesterfield Unit 6

FGD System Training Seminar

Day 1, Slide 1

2.3.2 System Overview

Two Stage

Mist Eliminator

Dual Flow Tray

Two Stage

Mist Eliminator

Dual Flow 
Dominion – Chesterfield Unit 6

FGD System Training Seminar

Day 1, Slide 2

Flue Gas 

Absorbent Make-up 

Treated Flue Gas 

Absorber 

Spray Headers 

Oxidation Air 

SPRAY ZONE

MIST ELIMINATION

OXIDATION 

ZONE
Dominion – Chesterfield Unit 6

FGD System Training Seminar

Day 1, Slide 3

Dual Flow Tray
Dominion – Chesterfield Unit 6

FGD System Training Seminar

Day 1, Slide 4

Dual Flow Tray (from below)
Attachment 4 

Process Flow Diagram of the FGD Wastewater Treatment System